Threats of a bomb attack against a popular celebrity were posted on the Japanese version of Wikipedia, according to a police statement issued today. The poster wrote that a hand grenade would used to kill people at a concert featuring talento Ueto Aya (23) on August 31. Ueto is scheduled to perform at the “Happy Magic” event at Zepp Tokyo on that date, her first concert in about two years. Police at the nearby Tokyo Wangan Station issued a warning to organizers and requested that security be beefed up for the event. They are also investigating the incident as a possible criminal case. Such online abuse is common Wikipedia, which allows anyone to update it’s millions of information pages. The organization has recently begun looking at enforcing a change that would require editorial approval for all changes to pages about living people. A popular actress in TV dramas and commercials, Ueto is a former idol singer who is most often seen these days as the face of the Softbank mobile phone network (photo: Ueto and Softbank CEO Son Masayoshi).